Mangangka, Isri R. and Liu, An and Egodawatta, Prasanna and Goonetilleke, Ashantha
(2015)
Sectional analysis of stormwater treatment performance of a
constructed wetland.
Ecological Engineering, 77.
pp. 172-179.
Abstract
Constructed wetlands are among the most common Water Sensitive Urban Design (WSUD) measures for
stormwater treatment. These systems have been extensively studied to understand their performance
and influential treatment processes. Unfortunately, most past studies have been undertaken considering
a wetland system as a lumped system with a primary focus on the reduction of the event mean
concentration (EMC) values of specific pollutant species or total pollutant load removal. This research
study adopted an innovative approach by partitioning the inflow runoff hydrograph and then
investigating treatment performance in each partition and their relationships with a range of hydraulic
factors. The study outcomes confirmed that influenced by rainfall characteristics, the constructed
wetland displays different treatment characteristics for the initial and later sectors of the runoff
hydrograph. The treatment of small rainfall events (<15 mm) is comparatively better at the beginning of
runoff events while the trends in pollutant load reductions for large rainfall events (>15 mm) are
generally lower at the beginning and gradually increase towards the end of rainfall events. This highlights
the importance of ensuring that the inflow into a constructed wetland has low turbulence in order to
achieve consistent treatment performance for both, small and large rainfall events.
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